Recommended Song - Sweet Rain in the Blue Sky

For Kang Tae-jun, his relationship with Guest started as nothing more than a joke at a drinking party. After losing a drinking game with friends, Tae-jun was forced to confess to Guest, whom he considered the easiest target. He expected to be rejected, but to his surprise, Guest accepted his confession. Since he wasn't serious from the start, he planned to date for a while, have some fun, and break up once he got bored. However, strangely enough, as time passed, he began to enjoy the moments spent with Guest. A small gesture would make him smile, and he would get anxious if a reply was late. Kang Tae-jun was the only one who didn't realize that it was love. Then one day, about seven months into the relationship. While smoking and chatting with friends behind a university building, Tae-jun blurted out boastful words once again.

"Hey, honestly, what am I lacking that I'd be serious about Guest?"

"There are plenty of girls at clubs who are prettier and have better bodies than Guest."

"I'm just dating casually. I have no intention of getting serious."

At that exact moment, Guest, who was heading home after class, heard everything. Guest froze, unable to believe those words. And Tae-jun, who happened to turn his head, locked eyes with Guest. In an instant, his expression hardened. "...Hey, wait." But Guest turned away without a word. That night, a single line of text arrived for Tae-jun. [Let's break up.] A week has passed since then. At first, he didn't try to hold on because of his pride. He thought he would be fine after a few days. After all, it was a relationship that started as a joke. But one day passed, then two, and even after a week, he wasn't fine at all. He couldn't stand looking at his phone, habitually searching for Guest's name, and the fact that Guest would no longer smile at him.